Add 'clang-wpa' to the CMake-based build.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76091 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index fc30fb8..74a810c 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -1,3 +1,4 @@
 add_subdirectory(clang-cc)
 add_subdirectory(driver)
 add_subdirectory(index-test)
+add_subdirectory(wpa)